310 Dr. F. Briiggemaun on Stony Corals. 



the calicle is wider and the palifomi lobes less pronounced ; 

 but these may be individual peculiarities, whereas the before- 

 mentioned differences are undoubtedly signs of a more ad- 

 vanced age. 



In a young specimen from Borneo, the coral is attached by 

 a narrow base, the calicle is rounded oval, with scarcely a 

 trace of constriction in the middle of its sides ; there are only 

 ■;our cycles of septa, which are thin, broad, and much exsert, 

 without paliform lobes. 



Lastly, there is in the collection also a specimen in spirit 

 from North Australia (collected by J. B. Jukes ; " dredged 

 in 10 fathoms depth ") which appears to be specifically iden- 

 tical with the Bornean type. 



A. constricta differs from A. Geojfroyi and A. Lonsdalei 

 in the shape of its calicle, the regular development of the 

 septal cycles, and the strong paliform lobes ; from the formei-, 

 besides, in its strictly symmetrical form, in its narrow costse, 

 and in the structure of its columella, the latter being in A. 

 Geoffroyi truly spongious and consisting of irregularly 

 branched and coalescing lamellar trabeculse. 



IV. HOMOPHYLLIA. 



Coral neatly turbinate, with a narrow, somewhat expanded 

 base. Outside of wall covered almost to the edge with a 

 thin closely adherent epitheca, through which the cost£e are 

 distinctly perceptible. Costaj crowded, perfectly equal, pro- 

 minent, minutely denticulate. Calicle circular, deep. Edges 

 of septa with crowded, narrow, subequal teeth. Columella 

 very small, rounded in outline, coarsely trabecular. 



This genus is here established for the reception of the Caryo- 

 phyllia austrah's of Milne-Edwards and Haime, which the 

 authors had united with the ScoIymice,vemaYkmg at the same 

 time that, by its epitheca and small columella, it made an 

 approach to Thecojjhyllia { = 3IontltvaIfia). In addition to 

 this, the general shape of the coral, the deepness of its calicle 

 (caused by a scanty development of the endothecal dissepi- 

 ments), and especially the structure of the costas and septa 

 will justify its generic separation ; otherwise it would be neces- 

 sary to unite all the simple Mussaceee into one genus. The 

 differences from Cynarina have been given above; from An- 

 tillia it is distinguished by its circular development through- 

 out, by being attached by means of an expanded base in all 

 ages, by its thin and closely adherent epitheca, by the mode 

 of dentation of its septa, and by its small columella. 



